[ESME-292] Implement API2 methods for Tag/Conversation follow/unfollow

fixed unfollow tag

git-svn-id: https://svn.apache.org/repos/asf/esme/branches/api2-1.3@1150123 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/server/src/main/scala/org/apache/esme/api/API2.scala b/server/src/main/scala/org/apache/esme/api/API2.scala
index a4b35e0..cbd27cb 100644
--- a/server/src/main/scala/org/apache/esme/api/API2.scala
+++ b/server/src/main/scala/org/apache/esme/api/API2.scala
@@ -762,7 +762,7 @@
            val tagList = Tag.findAll(By(Tag.name, tagId.openOr("")))

            val tag = tagList.head

          

-         if (!tag.followers.contains(user)) { 

+         if (tag.followers.contains(user)) { 

             tag.followers -= user

             tag.save       

         }